Question 1

How does dryer fabric design affect CD moisture profile uniformity and corrugator warp?

PAPTEX Engineering Team · Accepted Answer

Cross-direction moisture variation is the number one cause of sheet warp on the corrugator. When one edge of the testliner sheet contains 1–2% more moisture than the other, the differential expansion during the corrugating heating cycle creates permanent bowing or twisting. PAPTEX dryer fabrics address this at the source: precision flat yarn weaving ensures uniform air permeability across the full fabric width (validated at 20+ QC inspection points), so every CD position evacuates moisture at the same rate. Combined with ±0.05 mm caliper tolerance for even heat transfer, the result is a CD moisture profile within ±1.5% variation — the threshold below which corrugator warp becomes statistically negligible in most operations.

Question 2

Will the dryer fabric mark the printable surface of testliner?

PAPTEX Engineering Team · Accepted Answer

Fabric marking on the top ply is a critical concern for testliner grades destined for flexo pre-print or post-print. PAPTEX addresses this through three design measures: (1) flat yarn construction with a smooth, low-profile surface finish that minimizes contact imprint depth on the sheet; (2) optimized yarn density that distributes contact pressure evenly, eliminating the isolated high-pressure points that cause visible marking patterns; (3) PTFE coating option that maintains surface smoothness throughout the fabric life by preventing contamination buildup, which is the most common cause of progressive marking in later service stages. For high-graphic print applications, we recommend the PTFE-coated variant and can provide surface roughness test data with every quotation.

Question 3

How does multi-ply testliner construction affect dryer fabric selection?

PAPTEX Engineering Team · Accepted Answer

Testliner is typically produced as 2-ply or 3-ply construction: a top ply with higher-quality fiber (virgin kraft or sorted OCC) for surface smoothness and printability, and a back/bottom ply with lower-cost recycled fiber. Each ply has different drainage, moisture retention, and drying characteristics. If the dryer fabric does not deliver uniform heat transfer to all plies simultaneously, the back ply may overdry while the top ply retains moisture — weakening inter-ply bonding (Scott Bond) and reducing overall SCT strength. PAPTEX addresses this with calibrated air permeability (350–550 CFM) and ±0.05 mm caliper tolerance that maintain consistent drying conditions across the full sheet thickness. For 3-ply machines with a middle filler ply, we adjust the CFM calculation to account for the additional water load.

Question 4

What is the typical service life of this dryer fabric?

PAPTEX Engineering Team · Accepted Answer

In tissue applications at 800–1,200 m/min: 6–12 months. In packaging/kraft at 400–800 m/min: 8–14 months. Actual life depends on steam temperature, contamination level (stickies, fillers), cleaning schedule, and tension consistency. PTFE coating extends life by 20–30% in high-contamination environments. We provide a wear inspection checklist with every order.

Question 5

Which seam type should I choose for my machine?

PAPTEX Engineering Team · Accepted Answer

Pin seam: recommended for most applications. Smooth, low-profile joint. Fastest installation. Spiral seam: for machines above 800 m/min where reduced air disturbance at the seam is critical. Loop seam: for on-machine seaming when the fabric cannot be pre-joined (limited access machines). Send us your machine drawing — our engineers will specify the optimal seam type.

Question 6

What air permeability (CFM) do I need?

PAPTEX Engineering Team · Accepted Answer

Air permeability selection depends on paper grade, machine speed, and dryer section configuration. Tissue: 400–550 CFM. Packaging/kraft: 500–650 CFM. Specialty: 350–450 CFM. Our application engineers calculate the optimal CFM using your machine parameters (speed, width, steam pressure, hood configuration, exhaust rate). This is included in every quotation.

Question 7

Can this fabric run on paper machines not listed in the compatibility table?

PAPTEX Engineering Team · Accepted Answer

Yes. The compatibility table lists machines where PAPTEX Flat Yarn fabrics have been installed and verified. The fabric is custom-manufactured to your machine width, length, and seam specification — it is compatible with any paper machine brand. Send us your machine brand, model, width, and speed. We check our installation database and confirm fitment within 24 hours.

Question 8

What information do you need to provide a quotation?

PAPTEX Engineering Team · Accepted Answer

Required: machine brand, model, width (mm), design speed (m/min), paper grade(s), basis weight range (GSM), and dryer section position. Helpful but not required: current fabric specifications, steam pressure (bar), dryer section layout drawing, current pain points (short life, contamination, sheet marking). Download our Machine Parameter Submission Form (Excel) for the complete checklist.

Question 9

How do I request a sample?

PAPTEX Engineering Team · Accepted Answer

A4-size sample: free, ships within 3 business days. Submit the sample request form with your machine brand, model, paper grade, and mailing address. Full-width trial piece (machine width × 2 meters): produced to your specifications, charged at production cost. Contact our engineer to arrange — we need your machine width and current fabric specifications.

Question 10

What is the minimum order quantity?

PAPTEX Engineering Team · Accepted Answer

1 piece per size. Each fabric is custom-manufactured to your exact dimensions. No minimum beyond this. Single-position orders accepted. Multi-position orders benefit from consolidated packing and shipping.

Question 11

How long does delivery take?

PAPTEX Engineering Team · Accepted Answer

Production: 15–25 days from order confirmation. First-time orders: add 1–2 days for engineering review. Express production: 7–10 days (surcharge applies). Sea freight: 15–45 days depending on destination port. Air freight: 3–7 days. We ship FOB Shanghai or CIF to your port. Pro forma invoice with estimated delivery date sent with order confirmation.

Question 12

What temperature can this fabric withstand?

PAPTEX Engineering Team · Accepted Answer

Standard polyester (PET) monofilament: continuous 180°C, peak 200°C (intermittent, ≤ 15 minutes). For higher temperatures: PPS (polyphenylene sulfide) monofilament rated to 220°C continuous. PEEK monofilament rated to 250°C continuous. Specify your maximum dryer temperature when requesting a quotation and we will confirm material suitability.

Question 13

Do you provide PTFE or anti-static coating?

PAPTEX Engineering Team · Accepted Answer

Yes. PTFE coating: applied during manufacturing, improves contamination release in high-stickiness grades (tissue with high recycled content, OCC). Anti-static coating: carbon-impregnated surface treatment for grades prone to static buildup (release paper, lightweight specialties). Both coatings are applied in-house. No post-installation treatment needed. Specify coating requirement when ordering.

Question 14

How is the fabric packed for international shipping?

PAPTEX Engineering Team · Accepted Answer

Each fabric is rolled on a 150 mm rigid PVC core, wrapped in moisture-barrier polyethylene film, labeled with order number, dimensions, position, seam type, and running direction arrow. Packed in reinforced plywood crate with desiccant packs. Crates are fumigated (ISPM 15 compliant) for international shipping. Standard crate weight: 80–250 kg depending on fabric size. Multi-fabric orders: each fabric separated by protective interleaving to prevent surface contact.

Question 15

How long does installation take?

PAPTEX Engineering Team · Accepted Answer

Typical installation: 2–4 hours for a single dryer section position (from lifting to running tension). This includes: lifting onto machine (15–30 min), threading through dryer section (30–60 min), seaming (30–90 min depending on seam type), tensioning and alignment (30–60 min), break-in run at reduced speed (24–48 hours at 80% normal tension). Full-speed operation after break-in. We provide a step-by-step installation checklist with every order.

Question 16

Do you provide installation support?

PAPTEX Engineering Team · Accepted Answer

Remote support (included): video-call guidance during installation. Our engineer watches your maintenance team and provides real-time instruction. On-site supervision (optional): engineer travels to your mill. Travel cost + daily rate. Typically 2–3 days: Day 1 preparation and inspection, Day 2 installation and commissioning, Day 3 break-in monitoring. Installation training for maintenance teams available.

Question 17

What are your payment terms?

PAPTEX Engineering Team · Accepted Answer

Standard: 30% T/T deposit with order confirmation, 70% before shipment. L/C at sight: available for orders above USD 10,000. Long-term customers (> 3 orders): flexible payment schedule available. All prices quoted FOB Shanghai or CIF destination. Pro forma invoice issued within 24 hours of order confirmation.

Question 18

Can you match the specifications of my current fabric?

PAPTEX Engineering Team · Accepted Answer

Yes. Send us your current fabric datasheet or a small sample (A4 size). Our lab analyzes: weave pattern, yarn diameter, thread density (warp/weft), air permeability, caliper, and material composition. We then produce a fabric that matches or exceeds each parameter. Reverse-engineering report provided within 5 business days. This is a free service.

Question 19

How do I measure my machine for a new fabric order?

PAPTEX Engineering Team · Accepted Answer

We need: (1) Machine width — the face width of the dryer roll (mm). (2) Fabric length — the total loop length measured along the fabric path in the dryer section (m). If you have the current fabric drawing or a paper machine layout diagram, send it and we calculate the dimensions. If not, use our Machine Parameter Submission Form — it includes a measurement guide with diagrams.

Question 20

What causes premature fabric failure?

PAPTEX Engineering Team · Accepted Answer

The four most common causes: (1) Incorrect tension — over-tensioning causes edge wear and seam elongation. Under-tensioning causes fabric flapping and guide roll tracking issues. (2) Contamination buildup — stickies and fillers clog the fabric surface, reducing air permeability and causing uneven drying. (3) Misalignment — fabric running off-center wears edges. (4) Incompatible cleaning chemicals — some solvents degrade polyester monofilament. Our installation guide covers all four with inspection checklists.

Question 21

How do I track my order after placement?

PAPTEX Engineering Team · Accepted Answer

After order confirmation, you receive: (1) pro forma invoice with estimated ship date, (2) production schedule confirmation within 3 business days, (3) pre-shipment photos (fabric on loom + QC inspection points) via email or WhatsApp, (4) shipping documents (bill of lading / air waybill, packing list, commercial invoice, certificate of origin) on ship date. Order status available by email or WhatsApp at any time.

Question 22

What quality inspections does each fabric undergo?

PAPTEX Engineering Team · Accepted Answer

20+ inspection points per fabric: raw material (monofilament diameter, tensile strength, elongation), in-process (weave pattern, thread density, visual defects), post-production (air permeability ISO 9237, caliper ISO 9073-2 at 12 points across width, tensile strength ISO 13934-1, seam strength, dimensional check), pre-shipment (visual final inspection, packing integrity). Quality certificate and test report shipped with every order.

Question 23

What after-sales support do you provide?

PAPTEX Engineering Team · Accepted Answer

Standard: 30-day post-installation check-in (email or call — we ask about running performance, any issues). Technical support available for the full service life of the fabric: performance troubleshooting, cleaning recommendations, wear assessment via photos. If a fabric fails before its expected service life, we analyze the returned sample (free) and provide a failure analysis report within 10 business days. This report helps prevent recurrence regardless of root cause.

Question 24

Can I visit the factory?

PAPTEX Engineering Team · Accepted Answer

Yes. Factory visits can be scheduled with 2 weeks notice. You will see: TEXO (Sweden) high-speed weaving looms, JAGER (Germany) automated heat-setting line, quality inspection laboratory, R&D testing center, packing and shipping area. Address: Industrial Park, Shenqiu County, Zhoukou City, Henan Province, China. Nearest international airport: Zhengzhou Xinzheng (CGO), approximately 2.5 hours by car. Hotel and transfer arranged on request.

Question 25

What quality certifications does PAPTEX hold?

PAPTEX Engineering Team · Accepted Answer

ISO 9001:2015 (quality management system). ISO 14001:2015 (environmental management). ISO 45001:2018 (occupational health and safety). 29 active patents. Quality certificate and lot-specific test report (air permeability, caliper, tensile strength, elongation) shipped with every order. Certificates available for download or inspection during factory visit.

Material	100% Polyester (PET) Monofilament
Construction	Flat yarn, multi-shed weave
Air Permeability	350 – 650 CFM (at 125 Pa, ISO 9237)
Continuous Operating Temperature	Up to 180°C
Peak Temperature	200°C (≤ 15 minutes)
Tensile Strength (Warp)	≥ 80 kN/m
Tensile Strength (Weft)	≥ 45 kN/m
Elongation at Break (Warp)	≤ 2.5% at 80 kN/m

Dryer Fabric for Testliner Paper Machines

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